How to make a round fence out of an array
Add a Plane and subdivide 20 cuts
Add a Circle and go in edit mode and Press F2 to fill the faces
Now go to top ortho view
Select the circle and then plane with shift select
Press Tab now
Press Space bar and type Knife projection
When it cut the circle Press P and select selection
Now the cut circle is separated. Delete the circle and plane and keep the new cut circle.
In edit mode Press Delete -&gt; select only faces.

Convert the cage now to curve
Add a curve circle and bevel it to give thickness to the edges.